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Need help: spikes in current measurement signal conditioning circuitry
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balage:
Well, we have disgussed the things with the guy I've mentioned.

1., Those spikes are there actually, as they are transients generated by the power switch, or by the power line plug.

2., We have not discussed the problem why I have seen spikes with those high amplitudes, as I was not able to reproduce them.

3., The probing itself (soldering RG174 as short as possible to the PCB) is correct, it is how such measurements are supposed to be probed. The ferrite core on the cable matters actually, parameters of the core matter much than I tought first.

In the meantime I have ignored this problem. It caused only the power meter IC to resetted not too often, but it can be managed in the firmware.

coppice:

--- Quote from: balage on October 12, 2019, 08:41:09 am ---Because up to 50 amps needs to be measured. No way to use a shunt.

After the signal conditioning circuitry it is much better.

--- End quote ---
The CS5463 was specifically designed for utility meters, where a shunt is used to measure up to 40A, 60A or even 100A with much better than 1% accuracy. "No way to use a shunt" would be a big surprise to most other people using this chip.

balage:
Hmm... You are right. But what kind of shunt it is inside utility meters? I mean the current itself is not routed onto the PCB, the shunt is the terminal block itself. Isn't it?

Also, a consumer one can measure 63 A, what means actually 100 A, because they can deal with a temporary overcurrent. I think.

I had to find a solution to put things into this box, so I have chosen the Hall-sensor version. I cannot still image how to deal with let's say 50 amps on a pcb.
StillTrying:

--- Quote from: balage on January 05, 2020, 11:54:10 am ---1., Those spikes are there actually, as they are transients generated by the power switch, or by the power line plug.
--- End quote ---

Well we know that, the question was is the noise in the GND and signal exactly the same so that the IC's input doesn't see it.

In this thread I think there's lots of evidence that the spikes in the signal aren't real, or at least much less than shown by the scope.
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